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Mathematics
OpenStudy (anonymous):

>Randy takes a walk using the following rules. First, he tosses a fair coin. If it falls heads, he walks 10 feet north. If it falls tails, he walks 10 feet south. He repeats this process every 10 feet and thus executes a "random walk." What is the probability that after 80 feet of walking, he will end up exactly 20 feet from the starting point?

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